<template>
    <view class="uni-navbar" :class="{'uni-dark':dark}">
        <view :class="{ 'uni-navbar--fixed': fixed, 'uni-navbar--shadow': shadow, 'uni-navbar--border': border }"
              :style="{ 'background-color': themeBgColor }" class="uni-navbar__content">
            <status-bar v-if="statusBar"/>
            <view :style="{ color: themeColor,backgroundColor: themeBgColor ,height:navbarHeight}"
                  class="uni-navbar__header">
                <view @tap="onClickLeft" class="uni-navbar__header-btns uni-navbar__header-btns-left"
                      :style="{width:leftIconWidth}">
                    <slot name="left">
                        <view class="uni-navbar__content_view" v-if="leftIcon.length > 0">
                            <uni-icons :color="themeColor" :type="leftIcon" size="20"/>
                        </view>
                        <view :class="{ 'uni-navbar-btn-icon-left': !leftIcon.length > 0 }" class="uni-navbar-btn-text"
                              v-if="leftText.length">
                            <text :style="{ color: themeColor, fontSize: '12px' }">{{ leftText }}</text>
                        </view>
                    </slot>
                </view>
                <view class="uni-navbar__header-container " @tap="onClickTitle">
                    <slot>
                        <view class="uni-navbar__header-container-inner" v-if="title.length>0">
                            <text class="uni-nav-bar-text uni-ellipsis-1"
                                  :style="{color: themeColor }">{{ title }}
                            </text>
                        </view>
                    </slot>
                </view>
                <view @click="onClickRight" class="uni-navbar__header-btns uni-navbar__header-btns-right"
                      :style="{width:rightIconWidth}">
                    <slot name="right">
                        <view v-if="rightIcon.length">
                            <uni-icons :color="themeColor" :type="rightIcon" size="22"/>
                        </view>
                        <view class="uni-navbar-btn-text" v-if="rightText.length && !rightIcon.length">
                            <text class="uni-nav-bar-right-text" :style="{ color: themeColor}">{{ rightText }}</text>
                        </view>
                    </slot>
                </view>
            </view>
        </view>
        <view class="uni-navbar__placeholder" v-if="fixed">
            <status-bar v-if="statusBar"/>
            <view class="uni-navbar__placeholder-view" :style="{ height:navbarHeight}"/>
        </view>
    </view>
</template>

<script>
    import statusBar from "./uni-status-bar.vue";

    const getVal = (val) => typeof val === 'number' ? val + 'px' : val;

    /**
     * NavBar 自定义导航栏
     * @description 导航栏组件，主要用于头部导航
     * @tutorial https://ext.dcloud.net.cn/plugin?id=52
     * @property {Boolean} dark 开启黑暗模式
     * @property {String} title 标题文字
     * @property {String} leftText 左侧按钮文本
     * @property {String} rightText 右侧按钮文本
     * @property {String} leftIcon 左侧按钮图标（图标类型参考 [Icon 图标](http://ext.dcloud.net.cn/plugin?id=28) type 属性）
     * @property {String} rightIcon 右侧按钮图标（图标类型参考 [Icon 图标](http://ext.dcloud.net.cn/plugin?id=28) type 属性）
     * @property {String} color 图标和文字颜色
     * @property {String} backgroundColor 导航栏背景颜色
     * @property {Boolean} fixed = [true|false] 是否固定顶部
     * @property {Boolean} statusBar = [true|false] 是否包含状态栏
     * @property {Boolean} shadow = [true|false] 导航栏下是否有阴影
     * @event {Function} clickLeft 左侧按钮点击时触发
     * @event {Function} clickRight 右侧按钮点击时触发
     * @event {Function} clickTitle 中间标题点击时触发
     */
    export default {
        name: "UniNavBar",
        components: {
            statusBar
        },
        emits: ['clickLeft', 'clickRight', 'clickTitle'],
        props: {
            dark: {
                type: Boolean,
                default: false
            },
            title: {
                type: String,
                default: ""
            },
            leftText: {
                type: String,
                default: ""
            },
            rightText: {
                type: String,
                default: ""
            },
            leftIcon: {
                type: String,
                default: ""
            },
            rightIcon: {
                type: String,
                default: ""
            },
            fixed: {
                type: [Boolean, String],
                default: false
            },
            color: {
                type: String,
                default: ""
            },
            backgroundColor: {
                type: String,
                default: ""
            },
            statusBar: {
                type: [Boolean, String],
                default: false
            },
            shadow: {
                type: [Boolean, String],
                default: false
            },
            border: {
                type: [Boolean, String],
                default: true
            },
            height: {
                type: [Number, String],
                default: 44
            },
            leftWidth: {
                type: [Number, String],
                default: 60
            },
            rightWidth: {
                type: [Number, String],
                default: 60
            },
        },
        computed: {
            themeBgColor() {
                if (this.dark) {
                    // 默认值
                    if (this.backgroundColor) {
                        return this.backgroundColor
                    } else {
                        return this.dark ? '#333' : '#FFF'
                    }
                }
                return this.backgroundColor || '#FFF'
            },
            themeColor() {
                if (this.dark) {
                    // 默认值
                    if (this.color) {
                        return this.color
                    } else {
                        return this.dark ? '#fff' : '#333'
                    }
                }
                return this.color || '#333'
            },
            navbarHeight() {
                return getVal(this.height)
            },
            leftIconWidth() {
                return getVal(this.leftWidth)
            },
            rightIconWidth() {
                return getVal(this.rightWidth)
            }
        },
        mounted() {
            if (uni.report && this.title !== '') {
                uni.report('title', this.title)
            }
        },
        methods: {
            onClickLeft() {
                this.$emit("clickLeft");
            },
            onClickRight() {
                this.$emit("clickRight");
            },
            onClickTitle() {
                this.$emit("clickTitle");
            }
        }
    };
</script>

<style lang="scss" scoped>
    $nav-height: 44px;

    .uni-navbar {
        // box-sizing: border-box;
    }

    .uni-nav-bar-text {
        /* #ifdef APP-PLUS */
        font-size: 34 rpx;
        /* #endif */
        /* #ifndef APP-PLUS */
        font-size: 14px;
        /* #endif */
    }

    .uni-nav-bar-right-text {
        font-size: 12px;
    }

    .uni-navbar__content {
        position: relative;
        // background-color: #fff;
        // box-sizing: border-box;
        background-color: transparent;
    }

    .uni-navbar__content_view {
        // box-sizing: border-box;
    }

    .uni-navbar-btn-text {
        /* #ifndef APP-NVUE */
        display: flex;
        /* #endif */
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        line-height: 12px;
    }

    .uni-navbar__header {
        /* #ifndef APP-NVUE */
        display: flex;
        /* #endif */
        padding: 0 10px;
        flex-direction: row;
        height: $nav-height;
        font-size: 12px;
    }

    .uni-navbar__header-btns {
        /* #ifndef APP-NVUE */
        overflow: hidden;
        display: flex;
        /* #endif */
        flex-wrap: nowrap;
        flex-direction: row;
        width: 120 rpx;
        // padding: 0 6px;
        justify-content: center;
        align-items: center;
        /* #ifdef H5 */
        cursor: pointer;
        /* #endif */
    }

    .uni-navbar__header-btns-left {
        /* #ifndef APP-NVUE */
        display: flex;
        /* #endif */
        width: 120 rpx;
        justify-content: flex-start;
        align-items: center;
    }

    .uni-navbar__header-btns-right {
        /* #ifndef APP-NVUE */
        display: flex;
        /* #endif */
        flex-direction: row;
        // width: 150rpx;
        // padding-right: 30rpx;
        justify-content: flex-end;
        align-items: center;
    }

    .uni-navbar__header-container {
        /* #ifndef APP-NVUE */
        display: flex;
        /* #endif */
        flex: 1;
        padding: 0 10px;
        overflow: hidden;
    }

    .uni-navbar__header-container-inner {
        /* #ifndef APP-NVUE */
        display: flex;
        /* #endif */
        flex: 1;
        flex-direction: row;
        align-items: center;
        justify-content: center;
        font-size: 12px;
        overflow: hidden;
        // box-sizing: border-box;
    }


    .uni-navbar__placeholder-view {
        height: $nav-height;
    }

    .uni-navbar--fixed {
        position: fixed;
        z-index: 998;
        /* #ifdef H5 */
        left: var(--window-left);
        right: var(--window-right);
        /* #endif */
        /* #ifndef H5 */
        left: 0;
        right: 0;
        /* #endif */

    }

    .uni-navbar--shadow {
        box-shadow: 0 1px 6px #ccc;
    }

    .uni-navbar--border {
        border-bottom-width: 1 rpx;
        border-bottom-style: solid;
        border-bottom-color: #eee;
    }

    .uni-ellipsis-1 {
        overflow: hidden;
        /* #ifndef APP-NVUE */
        white-space: nowrap;
        text-overflow: ellipsis;
        /* #endif */
        /* #ifdef APP-NVUE */
        lines: 1;
        text-overflow: ellipsis;
        /* #endif */
    }

    // 暗主题配置
    .uni-dark {
    }
</style>
